-Resistance: Fall of Man & Resistance 2 (i assume you like FPSs since you're getting KZ2):
-Heavenly Sword (good luck finding it, if not, rent it)
-Uncharted: Drake's Fortune (and get Uncharted 2: Among Thieves, it's coming this month)
-Ratchet & Clank Future: Tools of Destruction (Prepare for A Crack in Time, also coming this month)
-Valkyria Chronicles & Disgaea 3(Valkyria is a game worth playing even if you don't like SRPGs, Disgaea only if you like SRPGs and don't mind about the graphics)
-Folklore (if you like ARPGs)
-LittleBigPlanet
-Infamous
-Demon's Souls
-Lair & Haze (just kidding)
Now, Alan Wake and Mass Effect 2 sigs give me the impression that you own a 360, but since i can play both of them on PC (and i plan to) i don't know, so if you don't have a 360, say it so we can recommend some multis...